"Menstrual blood is blood that is black and recognizable, so if it is like that, then stop praying, and if it is otherwise, then perform Wudu' and pray." Abu 'Abdur-Rahman said: Others reported this Hadith, and none of them mentioned what Ibn Abi 'Adi mentioned. And Allah Most High, knows best.  

أَنَّ فَاطِمَةَ بِنْتَ أَبِي حُبَيْشٍ كَانَتْ تُسْتَحَاضُ فَقَالَ لَهَا رَسُولُ اللَّهِ ﷺ إِنَّ دَمَ الْحَيْضِ دَمٌ أَسْوَدُ يُعْرَفُ فَإِذَا كَانَ ذَلِكِ فَأَمْسِكِي عَنِ الصَّلاَةِ وَإِذَا كَانَ الآخَرُ فَتَوَضَّئِي وَصَلِّي قَالَ أَبُو عَبْدِ الرَّحْمَنِ قَدْ رَوَى هَذَا الْحَدِيثَ غَيْرُ وَاحِدٍ لَمْ يَذْكُرْ أَحَدٌ مِنْهُمْ مَا ذَكَرَهُ ابْنُ أَبِي عَدِيٍّ وَاللَّهُ تَعَالَى أَعْلَمُ  

[Machine] "Fāṭimah, the daughter of Abi Hubaysh, used to have menstruation. So the Messenger of Allah ﷺ said, 'Indeed, the blood of menstruation is black in color and can be recognized. So if that is the case, then abstain from prayers. But if it is the other (non-menstrual discharge), then perform ablution and pray.'"  

أَنَّ فَاطِمَةَ بِنْتَ أَبِي حُبَيْشٍ كَانَتْ تُسْتَحَاضُ فَقَالَ رَسُولُ اللَّهِ ﷺ «إِنَّ دَمَ الْحَيْضِ دَمٌ أَسْوَدُ يُعْرَفُ فَإِذَا كَانَ ذَلِكَ فَأَمْسِكِي عَنِ الصَّلَاةِ فَإِذَا كَانَ الْآخَرُ فَتَوَضَّئِي وَصَلِّي»